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<? $values = array( '-0', -0, 0, 123, -123, '123', '-123', '0123', '123 ', '0', '000', '+123', '1.23', 1.23, '123e4', '0x123', 'potato', 'EEBD', false, null, ); echo("PHP version: ".phpversion()."\n\n"); foreach($values as $value){ echo("TRYING WITH "); var_dump($value); echo("is_int: "); var_dump(is_int($value)); echo("is_numeric: "); var_dump(is_numeric($value)); echo("regex: "); var_dump(preg_match('/^\-?[0-9]+$/',$value)); echo("ctype_digit: "); var_dump(ctype_digit(ltrim((string)$value, '-'))); echo("filter_var: "); var_dump(filter_var($value, FILTER_VALIDATE_INT)); echo("\n"); echo("\n"); } ?>
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 7, Position 2 = 55
Branch analysis from position: 7
2 jumps found. (Code = 78) Position 1 = 8, Position 2 = 55
Branch analysis from position: 8
1 jumps found. (Code = 42) Position 1 = 7
Branch analysis from position: 7
Branch analysis from position: 55
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 55
filename:       /in/QlBFS
function name:  (null)
number of ops:  57
compiled vars:  !0 = $values, !1 = $value
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
   25     1        INIT_FCALL                                               'phpversion'
          2        DO_ICALL                                         $3      
          3        CONCAT                                           ~4      'PHP+version%3A+', $3
          4        CONCAT                                           ~5      ~4, '%0A%0A'
          5        ECHO                                                     ~5
   27     6      > FE_RESET_R                                       $6      !0, ->55
          7    > > FE_FETCH_R                                               $6, !1, ->55
   28     8    >   ECHO                                                     'TRYING+WITH+'
   29     9        INIT_FCALL                                               'var_dump'
         10        SEND_VAR                                                 !1
         11        DO_ICALL                                                 
   31    12        ECHO                                                     'is_int%3A+'
   32    13        INIT_FCALL                                               'var_dump'
         14        TYPE_CHECK                                   16  ~8      !1
         15        SEND_VAL                                                 ~8
         16        DO_ICALL                                                 
   34    17        ECHO                                                     'is_numeric%3A+'
   35    18        INIT_FCALL                                               'var_dump'
         19        INIT_FCALL                                               'is_numeric'
         20        SEND_VAR                                                 !1
         21        DO_ICALL                                         $10     
         22        SEND_VAR                                                 $10
         23        DO_ICALL                                                 
   37    24        ECHO                                                     'regex%3A+'
   38    25        INIT_FCALL                                               'var_dump'
         26        INIT_FCALL                                               'preg_match'
         27        SEND_VAL                                                 '%2F%5E%5C-%3F%5B0-9%5D%2B%24%2F'
         28        SEND_VAR                                                 !1
         29        DO_ICALL                                         $12     
         30        SEND_VAR                                                 $12
         31        DO_ICALL                                                 
   40    32        ECHO                                                     'ctype_digit%3A+'
   41    33        INIT_FCALL                                               'var_dump'
         34        INIT_FCALL                                               'ctype_digit'
         35        INIT_FCALL                                               'ltrim'
         36        CAST                                          6  ~14     !1
         37        SEND_VAL                                                 ~14
         38        SEND_VAL                                                 '-'
         39        DO_ICALL                                         $15     
         40        SEND_VAR                                                 $15
         41        DO_ICALL                                         $16     
         42        SEND_VAR                                                 $16
         43        DO_ICALL                                                 
   43    44        ECHO                                                     'filter_var%3A+'
   44    45        INIT_FCALL                                               'var_dump'
         46        INIT_FCALL                                               'filter_var'
         47        SEND_VAR                                                 !1
         48        SEND_VAL                                                 257
         49        DO_ICALL                                         $18     
         50        SEND_VAR                                                 $18
         51        DO_ICALL                                                 
   45    52        ECHO                                                     '%0A'
   46    53        ECHO                                                     '%0A'
   27    54      > JMP                                                      ->7
         55    >   FE_FREE                                                  $6
   48    56      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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